基于ElGamal公钥体制的动态(k,n)门限密钥托管方案

Dynamic Threshold Key Escrow Scheme Based on ElGamal Public Cryptosystem

首先对文献[3]所提出的门限密钥分割方案进行了整理分析,具体分析了其动态性,然后在此基础上提出了一种新的基于ElGamal公钥体制的动态(k,n)门限密钥托管方案.该方案具有如下特点:(1)可以防止阈下信道攻击;(2)在监听过程中,监听机构可以对托管代理交给其的子密钥进行验证;(3)解决了"一次监听,永久监听问题";(4)具有动态性质.

A threshold secret key sharing scheme given by paper [3] is tidied up and analyzed, its dynamic is discussed, and a new dynamic （ k, n ） threshold scheme based on EIGamal public key cryptosystem is proposed. The scheme has the following properties： it can prevent subliminal attack, monitor department can verify correctness of the secret shadow which was given by escrow agent during monitor procedure, the problem of ＂once monitor, monitor forever＂ is solved, and it is dynamic.